#235: Separated out text strings for *_alert_none

Signed-off-by: ziycon <ziycon.eire@gmail.com>

Separated out strings so they can be translated individually, I only broke msg_alert_none into two strings, topic_alert_none and pm_alert_none and removed msg_alert_none. If anyone feels this should be three strings let me know.

The reason I did only two strings is that the code that the strings were being used in related to pms and topics only, nothing else.